1 /* 2 * Copyright (c) 1983, 1995 Eric P. Allman 3 * Copyright (c) 1988, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * %sccs.include.redist.c% 7 */ 8 9 # include "sendmail.h" 10 11 #ifndef lint 12 #ifdef SMTP 13 static char sccsid[] = "@(#)usersmtp.c 8.46 (Berkeley) 04/21/95 (with SMTP)"; 14 #else 15 static char sccsid[] = "@(#)usersmtp.c 8.46 (Berkeley) 04/21/95 (without SMTP)"; 16 #endif 17 #endif /* not lint */ 18 19 # include <sysexits.h> 20 # include <errno.h> 21 22 # ifdef SMTP 23 24 /* 25 ** USERSMTP -- run SMTP protocol from the user end. 26 ** 27 ** This protocol is described in RFC821. 28 */ 29 30 #define REPLYTYPE(r) ((r) / 100) /* first digit of reply code */ 31 #define REPLYCLASS(r) (((r) / 10) % 10) /* second digit of reply code */ 32 #define SMTPCLOSING 421 /* "Service Shutting Down" */ 33 34 char SmtpMsgBuffer[MAXLINE]; /* buffer for commands */ 35 char SmtpReplyBuffer[MAXLINE]; /* buffer for replies */ 36 char SmtpError[MAXLINE] = ""; /* save failure error messages */ 37 int SmtpPid; /* pid of mailer */ 38 bool SmtpNeedIntro; /* need "while talking" in transcript */ 39 40 #ifdef __STDC__ 41 extern smtpmessage(char *f, MAILER *m, MCI *mci, ...); 42 #endif 43 /* 44 ** SMTPINIT -- initialize SMTP. 45 ** 46 ** Opens the connection and sends the initial protocol. 47 ** 48 ** Parameters: 49 ** m -- mailer to create connection to. 50 ** pvp -- pointer to parameter vector to pass to 51 ** the mailer. 52 ** 53 ** Returns: 54 ** none. 55 ** 56 ** Side Effects: 57 ** creates connection and sends initial protocol. 58 */ 59 60 smtpinit(m, mci, e) 61 struct mailer *m; 62 register MCI *mci; 63 ENVELOPE *e; 64 { 65 register int r; 66 register char *p; 67 extern void esmtp_check(); 68 extern void helo_options(); 69 70 if (tTd(18, 1)) 71 { 72 printf("smtpinit "); 73 mci_dump(mci, FALSE); 74 } 75 76 /* 77 ** Open the connection to the mailer. 78 */ 79 80 SmtpError[0] = '\0'; 81 CurHostName = mci->mci_host; /* XXX UGLY XXX */ 82 if (CurHostName == NULL) 83 CurHostName = MyHostName; 84 SmtpNeedIntro = TRUE; 85 switch (mci->mci_state) 86 { 87 case MCIS_ACTIVE: 88 /* need to clear old information */ 89 smtprset(m, mci, e); 90 /* fall through */ 91 92 case MCIS_OPEN: 93 return; 94 95 case MCIS_ERROR: 96 case MCIS_SSD: 97 /* shouldn't happen */ 98 smtpquit(m, mci, e); 99 /* fall through */ 100 101 case MCIS_CLOSED: 102 syserr("451 smtpinit: state CLOSED"); 103 return; 104 105 case MCIS_OPENING: 106 break; 107 } 108 109 mci->mci_state = MCIS_OPENING; 110 111 /* 112 ** Get the greeting message. 113 ** This should appear spontaneously. Give it five minutes to 114 ** happen. 115 */ 116 117 SmtpPhase = mci->mci_phase = "client greeting"; 118 setproctitle("%s %s: %s", e->e_id, CurHostName, mci->mci_phase); 119 r = reply(m, mci, e, TimeOuts.to_initial, esmtp_check); 120 if (r < 0 || REPLYTYPE(r) == 4) 121 goto tempfail1; 122 if (REPLYTYPE(r) != 2) 123 goto unavailable; 124 125 /* 126 ** Send the HELO command. 127 ** My mother taught me to always introduce myself. 128 */ 129 130 if (bitnset(M_ESMTP, m->m_flags)) 131 mci->mci_flags |= MCIF_ESMTP; 132 133 tryhelo: 134 if (bitset(MCIF_ESMTP, mci->mci_flags)) 135 { 136 smtpmessage("EHLO %s", m, mci, MyHostName); 137 SmtpPhase = mci->mci_phase = "client EHLO"; 138 } 139 else 140 { 141 smtpmessage("HELO %s", m, mci, MyHostName); 142 SmtpPhase = mci->mci_phase = "client HELO"; 143 } 144 setproctitle("%s %s: %s", e->e_id, CurHostName, mci->mci_phase); 145 r = reply(m, mci, e, TimeOuts.to_helo, helo_options); 146 if (r < 0) 147 goto tempfail1; 148 else if (REPLYTYPE(r) == 5) 149 { 150 if (bitset(MCIF_ESMTP, mci->mci_flags)) 151 { 152 /* try old SMTP instead */ 153 mci->mci_flags &= ~MCIF_ESMTP; 154 goto tryhelo; 155 } 156 goto unavailable; 157 } 158 else if (REPLYTYPE(r) != 2) 159 goto tempfail1; 160 161 /* 162 ** Check to see if we actually ended up talking to ourself. 163 ** This means we didn't know about an alias or MX, or we managed 164 ** to connect to an echo server. 165 */ 166 167 p = strchr(&SmtpReplyBuffer[4], ' '); 168 if (p != NULL) 169 *p = '\0'; 170 if (!bitnset(M_NOLOOPCHECK, m->m_flags) && 171 strcasecmp(&SmtpReplyBuffer[4], MyHostName) == 0) 172 { 173 syserr("553 %s config error: mail loops back to myself", 174 MyHostName); 175 mci->mci_exitstat = EX_CONFIG; 176 mci->mci_errno = 0; 177 smtpquit(m, mci, e); 178 return; 179 } 180 181 /* 182 ** If this is expected to be another sendmail, send some internal 183 ** commands. 184 */ 185 186 if (bitnset(M_INTERNAL, m->m_flags)) 187 { 188 /* tell it to be verbose */ 189 smtpmessage("VERB", m, mci); 190 r = reply(m, mci, e, TimeOuts.to_miscshort, NULL); 191 if (r < 0) 192 goto tempfail2; 193 } 194 195 if (mci->mci_state != MCIS_CLOSED) 196 { 197 mci->mci_state = MCIS_OPEN; 198 return; 199 } 200 201 /* got a 421 error code during startup */ 202 203 tempfail1: 204 tempfail2: 205 mci->mci_exitstat = EX_TEMPFAIL; 206 if (mci->mci_errno == 0) 207 mci->mci_errno = errno; 208 if (mci->mci_state != MCIS_CLOSED) 209 smtpquit(m, mci, e); 210 return; 211 212 unavailable: 213 mci->mci_exitstat = EX_UNAVAILABLE; 214 mci->mci_errno = errno; 215 smtpquit(m, mci, e); 216 return; 217 } 218 /* 219 ** ESMTP_CHECK -- check to see if this implementation likes ESMTP protocol 220 ** 221 ** Parameters: 222 ** line -- the response line. 223 ** firstline -- set if this is the first line of the reply. 224 ** m -- the mailer. 225 ** mci -- the mailer connection info. 226 ** e -- the envelope. 227 ** 228 ** Returns: 229 ** none. 230 */ 231 232 void 233 esmtp_check(line, firstline, m, mci, e) 234 char *line; 235 bool firstline; 236 MAILER *m; 237 register MCI *mci; 238 ENVELOPE *e; 239 { 240 register char *l; 241 242 for (l = line; (l = strchr(++l, 'E')) != NULL; ) 243 { 244 if (strncmp(l, "ESMTP ", 6) == 0) 245 { 246 mci->mci_flags |= MCIF_ESMTP; 247 break; 248 } 249 } 250 for (l = line; (l = strchr(++l, '8')) != NULL; ) 251 { 252 if (strncmp(l, "8BIT OK", 7) == 0) 253 { 254 mci->mci_flags |= MCIF_8BITOK; 255 break; 256 } 257 } 258 } 259 /* 260 ** HELO_OPTIONS -- process the options on a HELO line. 261 ** 262 ** Parameters: 263 ** line -- the response line. 264 ** firstline -- set if this is the first line of the reply. 265 ** m -- the mailer. 266 ** mci -- the mailer connection info. 267 ** e -- the envelope. 268 ** 269 ** Returns: 270 ** none. 271 */ 272 273 void 274 helo_options(line, firstline, m, mci, e) 275 char *line; 276 bool firstline; 277 MAILER *m; 278 register MCI *mci; 279 ENVELOPE *e; 280 { 281 register char *p; 282 283 if (firstline) 284 return; 285 286 if (strlen(line) < (SIZE_T) 5) 287 return; 288 line += 4; 289 p = strchr(line, ' '); 290 if (p != NULL) 291 *p++ = '\0'; 292 if (strcasecmp(line, "size") == 0) 293 { 294 mci->mci_flags |= MCIF_SIZE; 295 if (p != NULL) 296 mci->mci_maxsize = atol(p); 297 } 298 else if (strcasecmp(line, "8bitmime") == 0) 299 { 300 mci->mci_flags |= MCIF_8BITMIME; 301 mci->mci_flags &= ~MCIF_7BIT; 302 } 303 else if (strcasecmp(line, "expn") == 0) 304 mci->mci_flags |= MCIF_EXPN; 305 else if (strcasecmp(line, "x-dsn-03") == 0) 306 mci->mci_flags |= MCIF_DSN; 307 } 308 /* 309 ** SMTPMAILFROM -- send MAIL command 310 ** 311 ** Parameters: 312 ** m -- the mailer. 313 ** mci -- the mailer connection structure. 314 ** e -- the envelope (including the sender to specify). 315 */ 316 317 smtpmailfrom(m, mci, e) 318 struct mailer *m; 319 MCI *mci; 320 ENVELOPE *e; 321 { 322 int r; 323 char *bufp; 324 char *bodytype; 325 char buf[MAXNAME + 1]; 326 char optbuf[MAXLINE]; 327 328 if (tTd(18, 2)) 329 printf("smtpmailfrom: CurHost=%s\n", CurHostName); 330 331 /* set up appropriate options to include */ 332 if (bitset(MCIF_SIZE, mci->mci_flags) && e->e_msgsize > 0) 333 sprintf(optbuf, " SIZE=%ld", e->e_msgsize); 334 else 335 strcpy(optbuf, ""); 336 337 bodytype = e->e_bodytype; 338 if (bitset(MCIF_8BITMIME, mci->mci_flags)) 339 { 340 if (bodytype == NULL && 341 bitset(MM_MIME8BIT, MimeMode) && 342 bitset(EF_HAS8BIT, e->e_flags) && 343 !bitnset(M_8BITS, m->m_flags)) 344 bodytype = "8BITMIME"; 345 if (bodytype != NULL) 346 { 347 strcat(optbuf, " BODY="); 348 strcat(optbuf, bodytype); 349 } 350 } 351 else if (bitnset(M_8BITS, m->m_flags) || 352 !bitset(EF_HAS8BIT, e->e_flags) || 353 (e->e_bodytype != NULL && 354 strcasecmp(e->e_bodytype, "7bit") == 0)) 355 { 356 /* just pass it through */ 357 } 358 else if (bitset(MM_CVTMIME, MimeMode) && 359 (e->e_bodytype != NULL || !bitset(MM_PASS8BIT, MimeMode))) 360 { 361 /* must convert from 8bit MIME format to 7bit encoded */ 362 mci->mci_flags |= MCIF_CVT8TO7; 363 } 364 else if (!bitset(MM_PASS8BIT, MimeMode)) 365 { 366 /* cannot just send a 8-bit version */ 367 usrerr("%s does not support 8BITMIME", mci->mci_host); 368 return EX_DATAERR; 369 } 370 371 if (bitset(MCIF_DSN, mci->mci_flags)) 372 { 373 if (e->e_envid != NULL) 374 { 375 strcat(optbuf, " ENVID="); 376 strcat(optbuf, e->e_envid); 377 } 378 379 /* RET= parameter */ 380 if (bitset(EF_RET_PARAM, e->e_flags)) 381 { 382 strcat(optbuf, " RET="); 383 if (bitset(EF_NO_BODY_RETN, e->e_flags)) 384 strcat(optbuf, "HDRS"); 385 else 386 strcat(optbuf, "FULL"); 387 } 388 } 389 390 /* 391 ** Send the MAIL command. 392 ** Designates the sender. 393 */ 394 395 mci->mci_state = MCIS_ACTIVE; 396 397 if (bitset(EF_RESPONSE, e->e_flags) && 398 !bitnset(M_NO_NULL_FROM, m->m_flags)) 399 (void) strcpy(buf, ""); 400 else 401 expand("\201g", buf, sizeof buf, e); 402 if (buf[0] == '<') 403 { 404 /* strip off <angle brackets> (put back on below) */ 405 bufp = &buf[strlen(buf) - 1]; 406 if (*bufp == '>') 407 *bufp = '\0'; 408 bufp = &buf[1]; 409 } 410 else 411 bufp = buf; 412 if (bitnset(M_LOCALMAILER, e->e_from.q_mailer->m_flags) || 413 !bitnset(M_FROMPATH, m->m_flags)) 414 { 415 smtpmessage("MAIL From:<%s>%s", m, mci, bufp, optbuf); 416 } 417 else 418 { 419 smtpmessage("MAIL From:<@%s%c%s>%s", m, mci, MyHostName, 420 *bufp == '@' ? ',' : ':', bufp, optbuf); 421 } 422 SmtpPhase = mci->mci_phase = "client MAIL"; 423 setproctitle("%s %s: %s", e->e_id, CurHostName, mci->mci_phase); 424 r = reply(m, mci, e, TimeOuts.to_mail, NULL); 425 if (r < 0 || r == 421) 426 { 427 /* communications failure/service shutting down */ 428 mci->mci_exitstat = EX_TEMPFAIL; 429 mci->mci_errno = errno; 430 smtpquit(m, mci, e); 431 return EX_TEMPFAIL; 432 } 433 else if (REPLYTYPE(r) == 4) 434 { 435 return EX_TEMPFAIL; 436 } 437 else if (r == 250) 438 { 439 return EX_OK; 440 } 441 else if (r == 501 || r == 553) 442 { 443 /* syntax error in arguments/mailbox name not allowed */ 444 return EX_DATAERR; 445 } 446 else if (r == 552) 447 { 448 /* exceeded storage allocation */ 449 return EX_UNAVAILABLE; 450 } 451 452 #ifdef LOG 453 if (LogLevel > 1) 454 { 455 syslog(LOG_CRIT, "%s: %s: SMTP MAIL protocol error: %s", 456 e->e_id, mci->mci_host, SmtpReplyBuffer); 457 } 458 #endif 459 460 /* protocol error -- close up */ 461 smtpquit(m, mci, e); 462 return EX_PROTOCOL; 463 } 464 /* 465 ** SMTPRCPT -- designate recipient. 466 ** 467 ** Parameters: 468 ** to -- address of recipient. 469 ** m -- the mailer we are sending to. 470 ** mci -- the connection info for this transaction. 471 ** e -- the envelope for this transaction. 472 ** 473 ** Returns: 474 ** exit status corresponding to recipient status. 475 ** 476 ** Side Effects: 477 ** Sends the mail via SMTP. 478 */ 479 480 smtprcpt(to, m, mci, e) 481 ADDRESS *to; 482 register MAILER *m; 483 MCI *mci; 484 ENVELOPE *e; 485 { 486 register int r; 487 char optbuf[MAXLINE]; 488 489 strcpy(optbuf, ""); 490 if (bitset(MCIF_DSN, mci->mci_flags)) 491 { 492 /* NOTIFY= parameter */ 493 if (bitset(QHASNOTIFY, to->q_flags) && 494 bitset(QPRIMARY, to->q_flags)) 495 { 496 bool firstone = TRUE; 497 498 strcat(optbuf, " NOTIFY="); 499 if (bitset(QPINGONSUCCESS, to->q_flags)) 500 { 501 strcat(optbuf, "SUCCESS"); 502 firstone = FALSE; 503 } 504 if (bitset(QPINGONFAILURE, to->q_flags)) 505 { 506 if (!firstone) 507 strcat(optbuf, ","); 508 strcat(optbuf, "FAILURE"); 509 firstone = FALSE; 510 } 511 if (bitset(QPINGONDELAY, to->q_flags)) 512 { 513 if (!firstone) 514 strcat(optbuf, ","); 515 strcat(optbuf, "DELAY"); 516 firstone = FALSE; 517 } 518 if (firstone) 519 strcat(optbuf, "NEVER"); 520 } 521 522 /* ORCPT= parameter */ 523 if (to->q_orcpt != NULL) 524 { 525 strcat(optbuf, " ORCPT="); 526 strcat(optbuf, to->q_orcpt); 527 } 528 } 529 530 smtpmessage("RCPT To:<%s>%s", m, mci, to->q_user, optbuf); 531 532 SmtpPhase = mci->mci_phase = "client RCPT"; 533 setproctitle("%s %s: %s", e->e_id, CurHostName, mci->mci_phase); 534 r = reply(m, mci, e, TimeOuts.to_rcpt, NULL); 535 setstatus(to, SmtpReplyBuffer); 536 if (r < 0 || REPLYTYPE(r) == 4) 537 return (EX_TEMPFAIL); 538 else if (REPLYTYPE(r) == 2) 539 return (EX_OK); 540 else if (r == 550 || r == 551 || r == 553) 541 return (EX_NOUSER); 542 else if (r == 552 || r == 554) 543 return (EX_UNAVAILABLE); 544 545 #ifdef LOG 546 if (LogLevel > 1) 547 { 548 syslog(LOG_CRIT, "%s: %s: SMTP RCPT protocol error: %s", 549 e->e_id, mci->mci_host, SmtpReplyBuffer); 550 } 551 #endif 552 553 return (EX_PROTOCOL); 554 } 555 /* 556 ** SMTPDATA -- send the data and clean up the transaction. 557 ** 558 ** Parameters: 559 ** m -- mailer being sent to. 560 ** e -- the envelope for this message. 561 ** 562 ** Returns: 563 ** exit status corresponding to DATA command. 564 ** 565 ** Side Effects: 566 ** none. 567 */ 568 569 static jmp_buf CtxDataTimeout; 570 static void datatimeout(); 571 572 smtpdata(m, mci, e) 573 struct mailer *m; 574 register MCI *mci; 575 register ENVELOPE *e; 576 { 577 register int r; 578 register EVENT *ev; 579 time_t timeout; 580 581 /* 582 ** Send the data. 583 ** First send the command and check that it is ok. 584 ** Then send the data. 585 ** Follow it up with a dot to terminate. 586 ** Finally get the results of the transaction. 587 */ 588 589 /* send the command and check ok to proceed */ 590 smtpmessage("DATA", m, mci); 591 SmtpPhase = mci->mci_phase = "client DATA 354"; 592 setproctitle("%s %s: %s", e->e_id, CurHostName, mci->mci_phase); 593 r = reply(m, mci, e, TimeOuts.to_datainit, NULL); 594 if (r < 0 || REPLYTYPE(r) == 4) 595 { 596 smtpquit(m, mci, e); 597 return (EX_TEMPFAIL); 598 } 599 else if (r == 554) 600 { 601 smtprset(m, mci, e); 602 return (EX_UNAVAILABLE); 603 } 604 else if (r != 354) 605 { 606 #ifdef LOG 607 if (LogLevel > 1) 608 { 609 syslog(LOG_CRIT, "%s: %s: SMTP DATA-1 protocol error: %s", 610 e->e_id, mci->mci_host, SmtpReplyBuffer); 611 } 612 #endif 613 smtprset(m, mci, e); 614 return (EX_PROTOCOL); 615 } 616 617 /* 618 ** Set timeout around data writes. Make it at least large 619 ** enough for DNS timeouts on all recipients plus some fudge 620 ** factor. The main thing is that it should not be infinite. 621 */ 622 623 if (setjmp(CtxDataTimeout) != 0) 624 { 625 mci->mci_errno = errno; 626 mci->mci_exitstat = EX_TEMPFAIL; 627 mci->mci_state = MCIS_ERROR; 628 syserr("451 timeout writing message to %s", mci->mci_host); 629 smtpquit(m, mci, e); 630 return EX_TEMPFAIL; 631 } 632 633 timeout = e->e_msgsize / 16; 634 if (timeout < (time_t) 600) 635 timeout = (time_t) 600; 636 timeout += e->e_nrcpts * 300; 637 ev = setevent(timeout, datatimeout, 0); 638 639 /* 640 ** Output the actual message. 641 */ 642 643 (*e->e_puthdr)(mci, e->e_header, e); 644 (*e->e_putbody)(mci, e, NULL); 645 646 /* 647 ** Cleanup after sending message. 648 */ 649 650 clrevent(ev); 651 652 if (ferror(mci->mci_out)) 653 { 654 /* error during processing -- don't send the dot */ 655 mci->mci_errno = EIO; 656 mci->mci_exitstat = EX_IOERR; 657 mci->mci_state = MCIS_ERROR; 658 smtpquit(m, mci, e); 659 return EX_IOERR; 660 } 661 662 /* terminate the message */ 663 fprintf(mci->mci_out, ".%s", m->m_eol); 664 if (TrafficLogFile != NULL) 665 fprintf(TrafficLogFile, "%05d >>> .\n", getpid()); 666 if (Verbose) 667 nmessage(">>> ."); 668 669 /* check for the results of the transaction */ 670 SmtpPhase = mci->mci_phase = "client DATA 250"; 671 setproctitle("%s %s: %s", e->e_id, CurHostName, mci->mci_phase); 672 r = reply(m, mci, e, TimeOuts.to_datafinal, NULL); 673 if (r < 0) 674 { 675 smtpquit(m, mci, e); 676 return (EX_TEMPFAIL); 677 } 678 mci->mci_state = MCIS_OPEN; 679 e->e_statmsg = newstr(&SmtpReplyBuffer[4]); 680 if (REPLYTYPE(r) == 4) 681 return (EX_TEMPFAIL); 682 else if (r == 250) 683 return (EX_OK); 684 else if (r == 552 || r == 554) 685 return (EX_UNAVAILABLE); 686 #ifdef LOG 687 if (LogLevel > 1) 688 { 689 syslog(LOG_CRIT, "%s: %s: SMTP DATA-2 protocol error: %s", 690 e->e_id, mci->mci_host, SmtpReplyBuffer); 691 } 692 #endif 693 return (EX_PROTOCOL); 694 } 695 696 697 static void 698 datatimeout() 699 { 700 longjmp(CtxDataTimeout, 1); 701 } 702 /* 703 ** SMTPQUIT -- close the SMTP connection. 704 ** 705 ** Parameters: 706 ** m -- a pointer to the mailer. 707 ** 708 ** Returns: 709 ** none. 710 ** 711 ** Side Effects: 712 ** sends the final protocol and closes the connection. 713 */ 714 715 smtpquit(m, mci, e) 716 register MAILER *m; 717 register MCI *mci; 718 ENVELOPE *e; 719 { 720 bool oldSuprErrs = SuprErrs; 721 722 /* 723 ** Suppress errors here -- we may be processing a different 724 ** job when we do the quit connection, and we don't want the 725 ** new job to be penalized for something that isn't it's 726 ** problem. 727 */ 728 729 SuprErrs = TRUE; 730 731 /* send the quit message if we haven't gotten I/O error */ 732 if (mci->mci_state != MCIS_ERROR) 733 { 734 SmtpPhase = "client QUIT"; 735 smtpmessage("QUIT", m, mci); 736 (void) reply(m, mci, e, TimeOuts.to_quit, NULL); 737 SuprErrs = oldSuprErrs; 738 if (mci->mci_state == MCIS_CLOSED) 739 { 740 SuprErrs = oldSuprErrs; 741 return; 742 } 743 } 744 745 /* now actually close the connection and pick up the zombie */ 746 (void) endmailer(mci, e, NULL); 747 748 SuprErrs = oldSuprErrs; 749 } 750 /* 751 ** SMTPRSET -- send a RSET (reset) command 752 */ 753 754 smtprset(m, mci, e) 755 register MAILER *m; 756 register MCI *mci; 757 ENVELOPE *e; 758 { 759 int r; 760 761 SmtpPhase = "client RSET"; 762 smtpmessage("RSET", m, mci); 763 r = reply(m, mci, e, TimeOuts.to_rset, NULL); 764 if (r < 0) 765 mci->mci_state = MCIS_ERROR; 766 else if (REPLYTYPE(r) == 2) 767 { 768 mci->mci_state = MCIS_OPEN; 769 return; 770 } 771 smtpquit(m, mci, e); 772 } 773 /* 774 ** SMTPPROBE -- check the connection state 775 */ 776 777 smtpprobe(mci) 778 register MCI *mci; 779 { 780 int r; 781 MAILER *m = mci->mci_mailer; 782 extern ENVELOPE BlankEnvelope; 783 ENVELOPE *e = &BlankEnvelope; 784 785 SmtpPhase = "client probe"; 786 smtpmessage("RSET", m, mci); 787 r = reply(m, mci, e, TimeOuts.to_miscshort, NULL); 788 if (r < 0 || REPLYTYPE(r) != 2) 789 smtpquit(m, mci, e); 790 return r; 791 } 792 /* 793 ** REPLY -- read arpanet reply 794 ** 795 ** Parameters: 796 ** m -- the mailer we are reading the reply from. 797 ** mci -- the mailer connection info structure. 798 ** e -- the current envelope. 799 ** timeout -- the timeout for reads. 800 ** pfunc -- processing function for second and subsequent 801 ** lines of response -- if null, no special 802 ** processing is done. 803 ** 804 ** Returns: 805 ** reply code it reads. 806 ** 807 ** Side Effects: 808 ** flushes the mail file. 809 */ 810 811 reply(m, mci, e, timeout, pfunc) 812 MAILER *m; 813 MCI *mci; 814 ENVELOPE *e; 815 time_t timeout; 816 void (*pfunc)(); 817 { 818 register char *bufp; 819 register int r; 820 bool firstline = TRUE; 821 char junkbuf[MAXLINE]; 822 823 if (mci->mci_out != NULL) 824 (void) fflush(mci->mci_out); 825 826 if (tTd(18, 1)) 827 printf("reply\n"); 828 829 /* 830 ** Read the input line, being careful not to hang. 831 */ 832 833 for (bufp = SmtpReplyBuffer;; bufp = junkbuf) 834 { 835 register char *p; 836 extern time_t curtime(); 837 838 /* actually do the read */ 839 if (e->e_xfp != NULL) 840 (void) fflush(e->e_xfp); /* for debugging */ 841 842 /* if we are in the process of closing just give the code */ 843 if (mci->mci_state == MCIS_CLOSED) 844 return (SMTPCLOSING); 845 846 if (mci->mci_out != NULL) 847 fflush(mci->mci_out); 848 849 /* get the line from the other side */ 850 p = sfgets(bufp, MAXLINE, mci->mci_in, timeout, SmtpPhase); 851 mci->mci_lastuse = curtime(); 852 853 if (p == NULL) 854 { 855 bool oldholderrs; 856 extern char MsgBuf[]; /* err.c */ 857 858 /* if the remote end closed early, fake an error */ 859 if (errno == 0) 860 # ifdef ECONNRESET 861 errno = ECONNRESET; 862 # else /* ECONNRESET */ 863 errno = EPIPE; 864 # endif /* ECONNRESET */ 865 866 mci->mci_errno = errno; 867 mci->mci_exitstat = EX_TEMPFAIL; 868 oldholderrs = HoldErrs; 869 HoldErrs = TRUE; 870 usrerr("451 reply: read error from %s", mci->mci_host); 871 872 /* if debugging, pause so we can see state */ 873 if (tTd(18, 100)) 874 pause(); 875 mci->mci_state = MCIS_ERROR; 876 smtpquit(m, mci, e); 877 #ifdef XDEBUG 878 { 879 char wbuf[MAXLINE]; 880 char *p = wbuf; 881 if (e->e_to != NULL) 882 { 883 sprintf(p, "%s... ", e->e_to); 884 p += strlen(p); 885 } 886 sprintf(p, "reply(%s) during %s", 887 mci->mci_host, SmtpPhase); 888 checkfd012(wbuf); 889 } 890 #endif 891 HoldErrs = oldholderrs; 892 return (-1); 893 } 894 fixcrlf(bufp, TRUE); 895 896 /* EHLO failure is not a real error */ 897 if (e->e_xfp != NULL && (bufp[0] == '4' || 898 (bufp[0] == '5' && strncmp(SmtpMsgBuffer, "EHLO", 4) != 0))) 899 { 900 /* serious error -- log the previous command */ 901 if (SmtpNeedIntro) 902 { 903 /* inform user who we are chatting with */ 904 fprintf(CurEnv->e_xfp, 905 "... while talking to %s:\n", 906 CurHostName); 907 SmtpNeedIntro = FALSE; 908 } 909 if (SmtpMsgBuffer[0] != '\0') 910 fprintf(e->e_xfp, ">>> %s\n", SmtpMsgBuffer); 911 SmtpMsgBuffer[0] = '\0'; 912 913 /* now log the message as from the other side */ 914 fprintf(e->e_xfp, "<<< %s\n", bufp); 915 } 916 917 /* display the input for verbose mode */ 918 if (Verbose) 919 nmessage("050 %s", bufp); 920 921 /* process the line */ 922 if (pfunc != NULL) 923 (*pfunc)(bufp, firstline, m, mci, e); 924 925 firstline = FALSE; 926 927 /* if continuation is required, we can go on */ 928 if (bufp[3] == '-') 929 continue; 930 931 /* ignore improperly formated input */ 932 if (!(isascii(bufp[0]) && isdigit(bufp[0]))) 933 continue; 934 935 /* decode the reply code */ 936 r = atoi(bufp); 937 938 /* extra semantics: 0xx codes are "informational" */ 939 if (r >= 100) 940 break; 941 } 942 943 /* 944 ** Now look at SmtpReplyBuffer -- only care about the first 945 ** line of the response from here on out. 946 */ 947 948 /* save temporary failure messages for posterity */ 949 if (SmtpReplyBuffer[0] == '4' && SmtpError[0] == '\0') 950 (void) strcpy(SmtpError, SmtpReplyBuffer); 951 952 /* reply code 421 is "Service Shutting Down" */ 953 if (r == SMTPCLOSING && mci->mci_state != MCIS_SSD) 954 { 955 /* send the quit protocol */ 956 mci->mci_state = MCIS_SSD; 957 smtpquit(m, mci, e); 958 } 959 960 return (r); 961 } 962 /* 963 ** SMTPMESSAGE -- send message to server 964 ** 965 ** Parameters: 966 ** f -- format 967 ** m -- the mailer to control formatting. 968 ** a, b, c -- parameters 969 ** 970 ** Returns: 971 ** none. 972 ** 973 ** Side Effects: 974 ** writes message to mci->mci_out. 975 */ 976 977 /*VARARGS1*/ 978 #ifdef __STDC__ 979 smtpmessage(char *f, MAILER *m, MCI *mci, ...) 980 #else 981 smtpmessage(f, m, mci, va_alist) 982 char *f; 983 MAILER *m; 984 MCI *mci; 985 va_dcl 986 #endif 987 { 988 VA_LOCAL_DECL 989 990 VA_START(mci); 991 (void) vsprintf(SmtpMsgBuffer, f, ap); 992 VA_END; 993 994 if (tTd(18, 1) || Verbose) 995 nmessage(">>> %s", SmtpMsgBuffer); 996 if (TrafficLogFile != NULL) 997 fprintf(TrafficLogFile, "%05d >>> %s\n", getpid(), SmtpMsgBuffer); 998 if (mci->mci_out != NULL) 999 { 1000 fprintf(mci->mci_out, "%s%s", SmtpMsgBuffer, 1001 m == NULL ? "\r\n" : m->m_eol); 1002 } 1003 else if (tTd(18, 1)) 1004 { 1005 printf("smtpmessage: NULL mci_out\n"); 1006 } 1007 } 1008 1009 # endif /* SMTP */ 1010